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app.py
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# -*- coding: utf-8 -*-
import datetime
import getopt
import os
import requests
import string
import sys
import time
from requests.adapters import HTTPAdapter
from requests.packages.urllib3.util.retry import Retry
from prometheus_client import Metric, start_http_server
from prometheus_client.core import REGISTRY
class MetricsServerExporter:
def __init__(self):
self.svc_token = os.environ.get('K8S_FILEPATH_TOKEN', '/var/run/secrets/kubernetes.io/serviceaccount/token')
self.ca_cert = os.environ.get('K8S_CA_CERT_PATH', '/var/run/secrets/kubernetes.io/serviceaccount/ca.crt')
self.api_url = os.environ.get('K8S_ENDPOINT', 'https://kubernetes.default.svc')
self.names_blacklist = os.environ.get('NAMES_BLACKLIST', '').split(',')
self.namespaces = os.environ.get('NAMESPACE_WHITELIST','').split(',')
self.labelSelector = os.environ.get('LABEL_SELECTOR','')
self.api_nodes_url = "{}/apis/metrics.k8s.io/v1beta1/nodes".format(self.api_url)
self.api_pods_url = "{}/apis/metrics.k8s.io/v1beta1/pods".format( self.api_url)
self.insecure_tls = self.set_tls_mode()
self.token = self.set_token()
def set_tls_mode(self):
return ('--insecure-tls','') in options
def set_token(self):
if os.environ.get('K8S_TOKEN') is not None:
return os.environ.get('K8S_TOKEN')
if os.path.exists(self.svc_token):
with open(self.svc_token, 'r') as f:
os.environ['K8S_TOKEN'] = f.readline()
return os.environ.get('K8S_TOKEN')
return None
def set_namespaced_pod_url(self,namespace):
return '{}/apis/metrics.k8s.io/v1beta1/namespaces/{}/pods?labelSelector={}'.format( self.api_url ,namespace,self.labelSelector )
def kube_metrics(self):
headers = { "Authorization": "Bearer {}".format(self.token) }
query = { 'labelSelector' : self.labelSelector }
session = requests.Session()
retry = Retry(total=3, connect=3, backoff_factor=0.1)
adapter = HTTPAdapter(max_retries=retry)
session.mount('http://', adapter)
session.mount('https://', adapter)
if self.insecure_tls:
session.verify = False
elif os.path.exists(self.ca_cert):
session.verify = self.ca_cert
if self.namespaces:
pod_data = None
for namespace in self.namespaces:
if pod_data is None:
pod_data = session.get(self.set_namespaced_pod_url(namespace), headers=headers, params=query).json()
else:
pod_data['items'] += session.get(self.set_namespaced_pod_url(namespace), headers=headers, params=query).json()['items']
payload = {
'nodes': session.get(self.api_nodes_url, headers=headers, params=query).json(),
'pods': pod_data
}
else:
payload = {
'nodes': session.get(self.api_nodes_url, headers=headers, params=query).json(),
'pods': session.get(self.api_pods_url, headers=headers, params=query).json()
}
return payload
def collect(self):
start_time = datetime.datetime.now()
ret = self.kube_metrics()
end_time = datetime.datetime.now()
total_time = (end_time - start_time).total_seconds()
nodes = ret['nodes']
pods = ret['pods']
metrics_nodes_mem = Metric('kube_metrics_server_nodes_mem', 'Metrics Server Nodes Memory', 'gauge')
metrics_nodes_cpu = Metric('kube_metrics_server_nodes_cpu', 'Metrics Server Nodes CPU', 'gauge')
metrics_response_time = Metric('kube_metrics_server_response_time', 'Metrics Server API Response Time', 'gauge')
metrics_response_time.add_sample('kube_metrics_server_response_time', value=total_time, labels={ 'api_url': '{}/metrics.k8s.io'.format(self.api_url) })
yield metrics_response_time
for node in nodes.get('items', []):
node_instance = node['metadata']['name']
node_cpu = node['usage']['cpu']
node_cpu = node_cpu.translate(str.maketrans('', '', string.ascii_letters))
node_mem = node['usage']['memory']
node_mem = node_mem.translate(str.maketrans('', '', string.ascii_letters))
metrics_nodes_mem.add_sample('kube_metrics_server_nodes_mem', value=int(node_mem), labels={ 'instance': node_instance })
metrics_nodes_cpu.add_sample('kube_metrics_server_nodes_cpu', value=int(node_cpu), labels={ 'instance': node_instance })
yield metrics_nodes_mem
yield metrics_nodes_cpu
metrics_pods_mem = Metric('kube_metrics_server_pods_mem', 'Metrics Server Pods Memory', 'gauge')
metrics_pods_cpu = Metric('kube_metrics_server_pods_cpu', 'Metrics Server Pods CPU', 'gauge')
for pod in pods.get('items', []):
pod_name = pod['metadata']['name']
pod_namespace = pod['metadata']['namespace']
pod_container_mem = 0
pod_container_cpu = 0
pod_container_name = ""
for container in pod['containers']:
pod_container_name = container['name']
pod_container_cpu = container['usage']['cpu']
pod_container_cpu = pod_container_cpu.translate(str.maketrans('', '', string.ascii_letters))
pod_container_mem = container['usage']['memory']
pod_container_mem = pod_container_mem.translate(str.maketrans('', '', string.ascii_letters))
if not any(blacklisted in self.names_blacklist for blacklisted in [pod_container_name, pod_name, pod_namespace]):
metrics_pods_mem.add_sample('kube_metrics_server_pods_mem', value=int(pod_container_mem), labels={ 'pod_name': pod_name, 'pod_namespace': pod_namespace, 'pod_container_name': pod_container_name })
metrics_pods_cpu.add_sample('kube_metrics_server_pods_cpu', value=int(pod_container_cpu), labels={ 'pod_name': pod_name, 'pod_namespace': pod_namespace, 'pod_container_name': pod_container_name })
yield metrics_pods_mem
yield metrics_pods_cpu
if __name__ == '__main__':
options, remainder = getopt.gnu_getopt(sys.argv[1:], '', ['insecure-tls'])
REGISTRY.register(MetricsServerExporter())
start_http_server(8000)
while True:
time.sleep(5)